I like the BG3 voices. There's nothing wrong with being a bit playful. They are very well done. I loved the Divinity OS 1 narrator as well.
Of course, one variant won't please everyone. I just played BG1 & 2 and found that narrator annoying. At least was better than the voices of the Assassin's Creed Valhalla, those really drive me crazy. So I get it.
I don't remember any game that had multiple narrator voice options so far, so maybe a toggle to turn on or off, and show only the text instead, would be the easiest & cheapest to implement, to solve this. Same for our own characters; some would prefer to "hear" that in their imagination.
